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F. K. ATHERTON AND 0. F. WEBB.

BURGLARALARM. APPLICATION FILED OCT-3!. I921.

Patented June 27,1922.

UNITED STATES PATENT OFFlfiE.

FRED K. ATHERTON AND CLARENCE F. WEBB, OF RACINE, WISCONSIN; SAID WEBB ASSIGNOR OF HIS ENTIRE R-IGHT TO CHRISTIAN P, PETERSEN, OF RACINE, WIS- CONSIN.

To all whom it may concern:

Be it known that we, FRED K. A'rHnRroN and CLARENCE F. WEBB, both citizens of the United States, and residents of Racine, in thecounty of Racine and State .of VVisconsin, have invented certain new andcuseful Improvements in Burglar.v Alarms; and We do hereby declare that the following is a full, clear, and exact description thereof.

Our invention refers to a burglar alarm, and it has forits primary object to provide for a simple, economical and safe burglar alarm capable of being attached in juxtaposition to a window or door, whereby the trigger may be tripped upon movement of the Window or door, to thus release a spring controlled firing pin, whereby. a cartridge is exploded.

Specific objections of our invention are to produce, as a manufacturing product, a simrough usage.

Another object of our invention is to provide a burglar alarm, having a simple and economical means for locking the firing plunger against inadvertent tripping when the same is not set for use.

Another object of our invention is to provide a bracket and housing for the mechanism, whereby the same is protected and sealed, so as to prevent injury to the party setting or operating the same.

WVith the above and other minor objects in View, the invention consists in certain peculiarities of construction and combination of parts, as are hereinafter set forth, with reference to the accompanying drawings and subsequently claimed.

In the drawings,

Figure 1 represents a plan view of a burglar alarm, embodying the features of my invention with parts broken away, and other parts in section to more clearly illustrate the details of construction.

Figure 2, a side elevation of the same,

said sashes being shown in section, and

Figure 4, a detailed cross section of the Specification of Letters Patent.

BUBGLAR ALARM.

Patented June 27, 1922.

Serial No. 511,607.

burglar alarm, showing the safety locking mechanism, the section beingindicated by line H of Figure 2.

Referring by characters to the drawings, 1 represents .a bracket, having apertured feet 2, which feet are secured to the frame .work of a building in juxtaposition to a door, or, as shown in Figure 3., to one of .the sash members A of a Window. The

bracket has projected therefrom, a centrally bored cartridge magazine 3, which magazine is aligned'with apertured ears 41- 1, that plug 6, the end of which plug is adapted to exert an exploding force against the cap of :a cartridge a, which is seated in the bore of the magazine 3. The firing plug has .mounted thereon, a coil spring 7, the lower end of which engages a cotter pin 8, while the upper end engages'the bottom face of the ear l. The outer end of the firing plug 6 is formedwith a right angle extension,

constituting a trigger 7 The firing plug also provided with a locking pin. 9, which pin is arranged to travel downwardly through the slot 5 of the lug 4: when the firing plug is released for action, the said pin being locked by engagement with the end ofthe lug surface of the lug 4, when the firing plug is set preparatory'to being tripped. In this position, the pin is at approximately 90 from the mouth of the slot 5, and the slot 5, at its mouth, is curved, to permit the pin 9 to automatically seek its line of travel through the slot, when said pin has been rotated a predetermined distance, with relation to its axis of oscillation.

As best shown in Figures 1 and 3 of the drawings, the firing plunger has been oscillated to its cocked position, in which position the coil spring 7 is compressed and the safety pin 9, in said position, holds the plunger preparatory to. a tripping action. As shown in Figure 3, the trigger 7' is extended in the path of travel of a lower sash member B. Hence, should the window 13' be moved upwardly or the window A downwardly, the trigger will be engaged and looked upon its bearings to a position that the pin 9 will ride upon the curved mouth of the slot, and coincident to this action, the spring will be free to cause the plunger to shoot downwardly and explode the cartridge a.

When the firing plunger has been retracted to load the spring 7 and, in some cases, for instance during the day, it is not desirable to have the burglar alarm set. Hence, a safety locking mechanism is provided. This locking mechanism com rises a transversely disposed stem 10, sh stem is journaled in suitable apertures formed in the ear 4 of the bracket. The outer end of the stem is turned upwardly to form a setting handle 10', and the central portion of the stem, as best shown in Figure 4, is provided with a tooth 11, which tooth is arranged to on e a similanoteh 11', that is formed in outer wall of the phm 7. This notch is arranged to register wi the setting stem tooth 11 when the plunger is retracted to its hooded position, and hence, in this position, should it be desiredto place the plunger at safety, the setting handle is rotated approximatehy a. quarter of a circle, whereby the tooth 11 will enter the notch 11' of the phmgm', and thus prevent action of the plunger irrespective of the position of the trigger. Hence it will be. seen that, when this safety lock ismanipuhted, the trigger, although rocked to a. trip position, will not function, due to the act 7 that itis held in its normal loaded position en age the plunger notch 11'.

lwiously, while we have shown and (bscribed the burglar alarm as a fixture, in connection with the slidi sash frames, it is understood that the mec anism can be either fastened to a door in such position that its trigger 7 will engage a fixed frame, or visa versa.

It is also understood that, while we have explained one exemplification of our invention in all of its details, the same may be varied within the scope of the claim, as understood by those skilled in the art.

We claim:

A burglar alarm for doors. and windows, comprising a. bracket adapted to be attached in juxtaposition thereto, having a cartridge magazine extending from the bracket and s aced apertured ears extending therefrom, a igned with the cartridge magazine, one of the ears being longitudinally slottedthe combination of a spring commute firin anger, having an ofiset trigger, the same -mg rectprocatively and oscillatorily mounted in the ear apertures, a. setting pin extending from the p r arranged to engage one end of the slotted lug to hold the phnger in a. firing position, and to be shifted for travel in the lug slot when said plunger is tripped, and a safety lock for the plunger, including a manual controlled setting stem, rotatably mounted in the slotted bracket lug, the stem being provided with an ofi'set setting handle, and a. tooth extending from the stem for enga ment with the plunger notch when said p unger is retracted to its loaded position.

In testimony that We claim the foregoing we have hereunto set our hands at Milwaukee, in the county of Milwaukee and State of Wisconsin.

FRED K. ATHERTON. CLARENCE F. WEBB. 

